numpy and pathlib json encoders

import json
from json import JSONEncoder
import numpy

class NumpyArrayEncoder(JSONEncoder):
    def default(self, obj):
        if isinstance(obj, numpy.ndarray):
            return obj.tolist()
        return JSONEncoder.default(self, obj)

class PathEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, Path):
            return str(obj)
        return json.JSONEncoder.default(self, obj)